title: Diverse patterns of cyclooxygenase-independent metalloproteinase gene regulation in human monocytes.
abstract: BACKGROUND AND PURPOSE Matrix metalloproteinase (MMP) production from monocyte/macrophages is implicated in matrix remodelling and modulation of inflammation. However, knowledge of the patterns and mechanisms of gene regulation of MMPs and their endogenous tissue inhibitors (TIMPs) is fragmentary. MMP up-regulation may be a target for cyclooxygenase (COX) and prostaglandin (PG) receptor inhibition, but the extent and mechanisms of COX-independent MMP up-regulation are unclear. EXPERIMENTAL APPROACH We studied MMP mRNA expression and selected protein levels in human peripheral blood monocytes before and after adhesion, upon stimulation with bacterial lipopolysaccharide (LPS), PGE(2) or forskolin and after culturing with monocyte colony-stimulating factor on plastic or human fibronectin for up to 7 days. KEY RESULTS Monocyte adherence for 2 h transiently up-regulated COX-2, MMP-1, MMP-7 and MMP-10 mRNAs, and persistently up-regulated MMP-2, MMP-9, MMP-14 and MMP-19 mRNAs. LPS, PGE(2) or forskolin selectively increased MMP-1, MMP-9, MMP-10, MMP-12 and MMP-14 mRNAs. LPS increased PGE(2) production through COX but up-regulated MMP levels independently of COX. Differential dependence on inhibition of p42/44 and p38 mitogen-activated protein kinases, c-jun N-terminal kinase and inhibitor of κB kinase2 paralleled the diverse patterns of MMP stimulation by LPS. Differentiation on plastic increased mRNA levels of MMP-7, MMP-9, MMP-12 and MMP-14 and TIMP-2 and TIMP-3 independently of COX; fibronectin accelerated MMP but not TIMP up-regulation. CONCLUSIONS AND IMPLICATIONS Adhesion, LPS stimulation and maturation of human monocytes lead to selective, COX-independent MMP and TIMP gene regulation, which is a potential target for selective inhibition by signalling kinase inhibitors.
authors.affiliation: Bristol Heart Institute, University of Bristol, Bristol, UK.
authors.forename: Buket
authors.initials: B
authors.lastname: Reel
authors.forename: Graciela B
authors.initials: GB
authors.lastname: Sala-Newby
authors.forename: Wei-Chun
authors.initials: WC
authors.lastname: Huang
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Newby
mesh_terms: D002448:Cell Adhesion / Q000187:drug effects*; D005576:Colforsin / Q000494:pharmacology; D015232:Dinoprostone / Q000378:metabolism; D005353:Fibronectins / Q000502:physiology; D005786:Gene Expression Regulation / Q000502:physiology*; D006801:Humans; D007249:Inflammation / Q000503:physiopathology; D048031:JNK Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism; D008070:Lipopolysaccharides / Q000378:metabolism; D045726:Metalloproteases / Q000502:physiology*; D009000:Monocytes / Q000201:enzymology / Q000378:metabolism*; D052003:NF-kappa B p52 Subunit / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D008517:Phytotherapy; D028321:Plant Preparations / Q000494:pharmacology; D010969:Plastics / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D019714:Tissue Inhibitor of Metalloproteinases / Q000096:biosynthesis / Q000235:genetics; D015854:Up-Regulation / Q000187:drug effects; D048051:p38 Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism
chemical_list: D005353:Fibronectins; D008070:Lipopolysaccharides; D052003:NF-kappa B p52 Subunit; C498206:NFKB2 protein, human; D028321:Plant Preparations; D010969:Plastics; D012333:RNA, Messenger; D019714:Tissue Inhibitor of Metalloproteinases; D005576:Colforsin; D011451:Prostaglandin-Endoperoxide Synthases; D048031:JNK Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D045726:Metalloproteases; D015232:Dinoprostone